Well drilling bit and its process of manufacture



R. O. PICKIN Sept. 11, 1934.

WELL DRILLING BIT AND ITS PROCESS OF MANUFACTURE Fil ed July 20, 1926 I INVENTOR. mod/(mad 0.

Patented Sept. 11, 1934 UNITED STATES WELL DRILLING BIT AND ITS PROCESS OF MANUFACTURE Rowland 0. Pickin, Los Angeles, Calif.

Application July 20, 1926, Serial No. 123,806

11 Claims.

This invention relates to the process of manufacturing abrasive bits and resulting product.

The bits are used for the purpose of drilling wells, such as oil, gas, water wells and the like by the rotary method of drilling, and which cut with a scraping or abrading action, and has for its object to render the process of manufacture more expeditious, certain, efficient, and less costly.

On the drawing:

Fig. 1 represents a front elevation showing the bit and illustrating the process of securing the pieces of abrasive in place, some of the abrasive being inclosed in the metal and one piece in place ready for being inclosed by the addition of welded-on metal.

Fig. 2 is a side view of Fig. 1.

Fig. 3 represents a front elevation of a bit showing one side of the frame being formed by welding on added metal, with the abrasive be- .I ing also added, the bit having been worn out of gauge.

Similar numerals refer to similar parts throughout the several views.

- The bit consists of a shank 11, pin connection .5 13, water course 15, and a frame 17, containing abrasive 19, Figs. 1, 2, and 3.

The frame 17, and the abrasive 19, come in contact with the bore hole, and together form the cutting means, and are together worn away Q as the drilling of the hole progresses.

The abrasive consists of sticks or pieces of abrasive, which may be enclosed in a container, and is a hard material, having a higher melting point than the metal of the bit, of which a carbide 35 such as carborundum or like hard material having a very high melting point is an example. The abrasive 19 is spaced and positioned so as to allow the molten steel 21, Figs. 1, 2 and 3 or other suitable metal to surround the abrasive as shown at 23, Figs. 1, 2 and 3.

I build up the frame 17 by welding on metal 25, around added abrasive 2'7, Figs. 1, 2 and 3.

This procedure is followed in the case of a portion 29, Fig. 3 becoming broken off or worn away as abrasive may be added as well as a portion of the frame.

This makes the bit of competitive value, whereas the cost would otherwise be too high, if the whole bit had to be discarded after being worn out of gauge, as shown at 29, Fig. 3.

It is thought that those familiar with the art will readily understand the above description, and be able to put the invention into practical operation without further detail, and although a various changes may be made in the composition of the materials, it is thought that this will not detract from the spirit and scope of the invention or sacrifice any of its material advantages.

I claim:

1. A process of manufacturing rotary well tools used for the purpose of drilling wells, which consists of placing pieces of abrasive on the cutting portion of the tool and building up the cutting edge of the tool by surrounding pieces of abrasivewith added welded on metal, so that the welded metal and the abrasive come in contact with the well and together form the cutting means and are together worn away as the drillmg progresses.

2. A process of manufacturing rotary well tools used for the purpose of drilling wells, which consists of securing pieces of abrasive in the cutting portion of the tool by building up the tool with added welded on metal and inclosing the abrasive in the built up metal, so that as the built up welded metal and abrasive come in contact with the well they are together worn away as the tool cuts the formation.

3. A process of manufacturing abrasive bits used for the purpose of drilling wells, which consists in placing pieces of abrasives on the cutting frame of the bit, and then building up a wall about said abrasives by welding on additional steel to secure said abrasives to said frame so that the added steel, the abrasive and the frame form the cutting means.

4. A process of manufacturing rotary well tools used for the purpose of drilling wells, which consists in placing pieces of abrasives on the cutting portion of the tool, and then building up the cutting edge of the tool by surrounding said pieces of abrasives with added welded on steel, so that the welded steel and the abrasives are together worn away as the drilling progresses.

5. A process of manufacturing a cutting tool, which comprises applying pieces of abrasive to the cutting frame of the tool, and securing the said pieces of abrasive thereto by welding added molten metal to the cutting frame by building up said frame and surrounding said pieces of abrasive with said added molten metal.

6. A rotary drill bit embodying a cutting frame, pieces of abrasive secured to said cutting frame in a surrounding progressively built up welding metal, the said built up welding metal being secured to said cutting frame by a weld.

'7. A rotary drill bit embodying a supporting portion and a cutting portion, pieces of abrasive secured to said cutting portion in a surrounding progressively built up welding metal, the said welding metal being secured to said cutting portion by a weld.

8. A process of reclaiming a worn drilling tool, which consists in building up the worn cutting portion of the tool, and securing pieces of abrasive in the cutting portion by surrounding the said pieces of abrasive in added molten metal, and welding the said added molten metal to the cutting portion of the tool.

9. A process of reclaiming a worn cutting tool,

which consists in building up the worn cutting portion of the'tool, and then securing pieces of abrasive to the built up portion by surrounding 1 the said pieces of abrasive in added molten metal,

and welding the said added molten metal to th built up portion of the tool.

10. A process of reclaiming a worn cutting tool, which consists in building up the worn cutting portion of the toolwith pieces of abrasive surrounded in added molten metal and welding the said added molten metal to the tool.

11. A process of reclaiming a worn cutting tool, which consists in building up the worn cutting portion or the tool and surrounding pieces of abrasive in added molten welded on metalwelded to the cutting portion of the tool, so that as the said added molten metal cools, the said pieces of abrasive remain surrounded by the said added metal.

- ROWLAND O.PICKIN. 

